What is the role of lamina lucida in the basement membrane?

• A. It provides structural support with collagen IV
• B. It forms a dense elastic layer
• C. It contains laminin anchors
• D. It provides initial adhesion layer

Answer: (D)

Lamina lucida is the immediate adhesion interface between epithelial cells and the underlying basement membrane. It’s rich in laminin and other glycoproteins that bind to receptors on the epithelial cell surface (like integrins and dystroglycan), enabling the cells to attach to the membrane. The actual structural framework of the basement membrane—providing robust support with collagen IV and forming the lamina densa—lies beneath this layer. So, the primary role of lamina lucida is to serve as the initial adhesion layer that anchors epithelial cells to the basement membrane.